weekend, 49 years later the questions remain -- lone gunman, the mob, cia, castro -- what happened in dallas? 30 p.m. eastern and pacific. >> truman got into politics after having failed that many businesses as a young man. the only way to get into politics in the missouri was to be part of a machine. he looked up with the pending breast machine, which was the most corrupt and often -- tender grass machine which was the most corrupt and often vicious. the second is what we all know about, how did he come to use the atomic bomb? what was behind the decision? what is the story behind the atomic bomb before he became president, and then when the decision was on his desk? it is still a controversial story, i wanted to know more about it. >> from his early life through his presidency, aida donald looks up the life of harry truman sunday night at 8:00 p.m. on c-span's "q&a." >> "washington journal" continues. host: joining us now is anna edney, who reports on the fda and other issues for bloomberg news. this issue stemmed from what is known as a compound in pharmacy. can you give us a history of w